public class EncryptAndDecrypt {
    String encrypt(String sourceString,String password) {
        char [] p= password.toCharArray();
        int n = p.length;
        char [] c = sourceString.toCharArray();
        int m = c.length;
        for(int k=0;k<m;k++){
            int mima=c[k]+p[k%n];
            c[k]=(char)mima;
        }
        return new String(c);
    }
    String decrypt(String sourceString,String password) {
        char [] p= password.toCharArray();
        int n = p.length;
        char [] c = sourceString.toCharArray();
        int m = c.length;
        for(int k=0;k<m;k++){
            int mima=c[k]-p[k%n];
            c[k]=(char)mima;
        }
        return new String(c);
    }
}